Göttingen 2025 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 23: Atmospheric Plasmas and their Applications VI
P 23.3: Vortrag
Donnerstag, 3. April 2025, 17:00–17:15, ZHG006
Spatio-temporal ignition pattern in sinusoidal-driven dielectric barrier discharges — •Hans Höft1, Markus M. Becker1, and Ronny Brandenburg1,2 — 1Leibniz Institute for Plasma Science and Technology (INP), Greifswald, Germany — 2Institute of Physics, University of Rostock, Rostock, Germany
Dielectric barrier discharges (DBDs) driven by sinusoidal high-voltage (HV) waveforms feature distinct spatio-temporal ignition pattern, which differs significantly from pulsed-operated DBDs, and are of importance for the performance of plasma-chemical reactors. This was investigated using a spatially 1D multi-filament DBD arrangement with a 1 mm gap (dielectric alumina, 1 mm around each rod electrode) and a lateral gap length of ≈ 10 mm in synthetic air at 1 bar. Electrical measurements were synchronised with iCCD and streak camera recordings to obtain information on the number of filaments and their spatio-temporal inception during the positive and negative half-cycle of the applied sinusoidal HV waveform with 11 and 14 kVpp at 10 kHz. It was found that the filament positions are fixed in both HV half-cycles corresponding to current pulse series. There are alternating positions during one half-cycle, i.e. the deposited surface charges prohibit the ignition for the same polarity of the HV waveform. This pattern, however, is stable only for some subsequent periods. Furthermore, the spatial stability disappears for higher HV amplitudes, when more than two filament series occur during one half-cycle of the HV waveform.
This work was funded by the Deutsche Forschungsgemeinschaft (DFG), project number: 535827833.
Keywords: Multi-filament dielectric barrier discharge; Electrical and Optical Diagnostics; Atmospheric pressure